298
supports only DN for signature
authentication.
Configuring the IKE keepalive feature
IKE sends keepalive packets to query the liveness of the peer. If the peer is configured with the
keepalive timeout time, you must configure the keepalive interval on the local device. If the peer
receives no keepalive packets during the timeout time, the IKE SA is deleted along with the IPsec
SAs it negotiated.
Follow these guidelines when you configure the IKE keepalive feature:
• Configure IKE DPD instead of the IKE keepalive feature unless IKE DPD is not supported on
the peer. The IKE keepalive feature sends keepalives at regular intervals, which consumes
network bandwidth and resources.
• The keepalive timeout time configured on the local device must be longer than the keepalive
interval configured at the peer. Since it seldom occurs that more than three consecutive packets
are lost on a network, you can set the keepalive timeout three times as long as the keepalive
interval.
To configure the IKE keepalive feature:
1. Enter system view.
system-view
N/A
2. Set the IKE SA keepalive
interval.
ike keepalive interval
seconds
By default, no keepalives are sent
to the peer.
3. Set the IKE SA keepalive
timeout time.
ike keepalive timeout
seconds
By default, IKE SA keepalive
never times out.
Configuring the IKE NAT keepalive feature
If IPsec traffic passes through a NAT device, you must configure the NAT traversal feature. If no
packet travels across an IPsec tunnel in a period of time, the NAT sessions are aged and deleted,
disabling the tunnel from transmitting data to the intended end. To prevent NAT sessions from being
aged, configure the NAT keepalive feature on the IKE gateway behind the NAT device to send NAT
keepalive packets to its peer periodically to keep the NAT session alive.
To configure the IKE NAT keepalive feature:
1. Enter system view.
system-view
N/A
2. Set the IKE NAT keepalive
interval.
ike nat-keepalive
seconds The default interval is 20 seconds.
Configuring IKE DPD
DPD detects dead peers. It can operate in periodic mode or on-demand mode.
• Periodic DPD—Sends a DPD message at regular intervals. It features an earlier detection of
dead peers, but consumes more bandwidth and CPU.
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